Срочно !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! По...

Question

Срочно !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! По математике!!!!!!!!! Задания на фотке !!!!

Answer 1

1) 2x+5-3x+5=4
-x=-6
X=6

Comments

2) cos^2x= 1-sin^2x => 1-sin^2x-3sinx-3=0
-2sin^2x - 3sinx = 0
Пусть sin^2x будет t=> -t^2-3t-2=0